Spatial normalization of lesioned brains: performance evaluation and impact on fMRI analyses

Area of Science:

• Neuroimaging
• Brain Imaging Analysis
• Medical Image Registration

Background:

• Spatial normalization is crucial for group analyses in neuroimaging.
• Brain lesions, such as stroke, complicate spatial normalization due to altered anatomy.
• Existing methods for normalizing lesioned brains have limitations.

Purpose of the Study:

• To identify the most effective spatial normalization techniques for structurally damaged brains.
• To determine if different normalization methods significantly impact functional activation inferences.
• To introduce novel protocols for evaluating normalization solutions in neuroimaging studies.

Main Methods:

• Conducted three experiments to compare different spatial normalization protocols.
• Evaluated the impact of normalization techniques on inter-subject image registration in lesioned brains.
• Assessed the effect of normalization on the accuracy of functional activation findings.

Main Results:

• Identified specific spatial normalization methods that perform best for brains with structural damage.
• Demonstrated that the choice of normalization technique can significantly influence conclusions drawn from functional activation data.
• Validated novel protocols for assessing normalization efficacy in clinical neuroimaging.

Conclusions:

• The selection of spatial normalization is critical for reliable group analyses in patients with brain lesions.
• The developed protocols offer a standardized approach to evaluating normalization methods in neuroimaging research.
• These findings have broad implications for structural and functional imaging studies involving patients with brain damage.